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Microchip Technology 24AA025E64-E/SN
- Part No.:
- 24AA025E64-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24AA025E64-E/SN.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,552
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Product details
Overview
24AA025E64-E/SN from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM with factory-programmed, globally unique EUI-64™ node address stored in write-protected memory (0xF8–0xFF). It operates from 1.7V to 5.5V, supports 400 kHz clock (100 kHz at VCC <2.5V), and delivers ≤1 µA standby current (I-temp) for low-power embedded identity storage in networked devices.
For engineers reviewing the 24AA025E64-E/SN datasheet, 24AA025E64-E/SN pinout, 24AA025E64-E/SN application, or 24AA025E64-E/SN equivalent, key selection criteria include EUI-64™ pre-programming integrity, 16-byte page write capability, SOT-23-6 or SOIC-8 package compatibility, I²C bus noise immunity via Schmitt-trigger inputs, and automotive-grade temperature operation (–40°C to +125°C).
Technical Context
The 24AA025E64-E/SN implements a two-block 128 × 8-bit EEPROM array with hardware write protection on upper half (0x80–0xFF). Its I²C slave interface uses fixed 4-bit control code '1010' followed by three chip-select bits (A2/A1/A0) and R/W bit - enabling up to eight devices on one bus (four in SOT-23-6 due to missing A2 pin).
Internal architecture includes HV generator for EEPROM programming, X/Y decoders, sense amplifiers, and write-protect circuitry. Address pointer auto-increments during sequential reads; page writes buffer up to 16 bytes before self-timed erase/write cycle (typ. 3 ms, max 5 ms), with ACK polling supported to detect completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8), organized as two 128-word blocks |
| Node Address | EUI-64™ (8-byte), factory-programmed and permanently write-protected in 0xF8–0xFF |
| Page Write Size | 16-byte buffer enables efficient bulk writes without host-side address management |
| VCC Range | 1.7V–5.5V - supports direct connection to Li-ion battery rails or 3.3V/5V logic domains |
| Max Clock Frequency | 400 kHz (≥2.5V), 100 kHz (1.7V–2.5V) - ensures timing compliance across voltage scaling |
| Endurance & Retention | 1 million erase/write cycles; >200 years data retention - suitable for lifetime device identity storage |
| ESD Protection | >4 kV HBM - robust against handling and board-level transients in industrial environments |
Pinout & Package
24AA025E64-E/SN is available in 8-lead SOIC (SN) and 6-lead SOT-23 packages. The /E suffix denotes automotive temperature grade (–40°C to +125°C); /SN indicates narrow SOIC package per JEDEC MS-012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip Select Input | LSB of 3-bit slave address; must be tied high/low for multi-device bus addressing |
| A1 | Chip Select Input | Mid-bit of 3-bit slave address; enables up to 8 devices on same I²C bus (4 in SOT-23-6) |
| A2 | Chip Select Input | MSB of 3-bit slave address; not bonded in SOT-23-6 package - must be set to '0' in control byte |
| VSS | Ground Reference | Return path for all internal circuits; requires low-impedance connection to system ground plane |
| SDA | Serial Data I/O | Open-drain bidirectional line; requires external pull-up (2 kΩ @ 400 kHz) and supports I²C ACK polling |
| SCL | Serial Clock Input | Master-generated clock; Schmitt-trigger input suppresses noise; slope-controlled to prevent ground bounce |
| VCC | Power Supply | 1.7V–5.5V supply; internal VCC threshold detector disables writes below ~1.5V to prevent corruption |
Key Features
| Feature | Design Value |
|---|---|
| Globally Unique EUI-64™ Address | Factory-programmed 8-byte IEEE-compliant identifier in protected memory - eliminates firmware provisioning overhead for MAC/IP identity |
| 16-Byte Page Write Buffer | Reduces I²C transaction count by 16× vs. byte-write; improves write throughput and reduces bus arbitration latency |
| Automotive Temperature Grade | Validated operation from –40°C to +125°C - qualified for under-hood, ADAS, and infotainment subsystems |
| Schmitt Trigger + Slope Control | Simultaneous noise suppression on SDA/SCL and controlled edge rates - prevents false Start/Stop detection in noisy automotive/industrial buses |
| Hardware Write Protection | Upper 128 bytes (0x80–0xFF) permanently locked - guarantees EUI-64™ integrity across power cycles and firmware updates |
Applications
| Industrial IoT Edge Node | Automotive Telematics Module |
|---|---|
Use Scenario: Securely storing unique device identity and calibration data in wireless sensor nodes deployed in factory automation systems. IC Role / Device Role / Timing Role: Non-volatile identity register and configuration store; accessed only during boot or over-the-air update - no real-time timing constraints. Use Value: Eliminates need for external provisioning infrastructure; EUI-64™ enables zero-touch onboarding into cloud platforms using IEEE-standardized addressing. | Use Scenario: Providing immutable hardware identity for cellular/V2X communication modules in connected vehicles. IC Role / Device Role / Timing Role: Tamper-resistant identity vault; read once at startup to seed cryptographic keys - operates within automotive ambient temperature extremes. Use Value: Meets ISO/SAE 21434 cybersecurity requirements for hardware-rooted identity; 125°C rating ensures reliability near engine compartments. |
| Medical Diagnostic Equipment | Smart Energy Meter |
Use Scenario: Storing FDA-mandated device serial numbers, manufacturing lot codes, and calibration coefficients in portable ultrasound or infusion pumps. IC Role / Device Role / Timing Role: Regulatory-compliant permanent memory; accessed during self-test or service mode - requires guaranteed data integrity over 10+ year product lifecycle. Use Value: >200-year data retention and 1M endurance ensure audit trail validity throughout equipment service life without refresh cycles. | Use Scenario: Holding utility-specific meter IDs, tariff tables, and tamper logs in ANSI C12.22-compliant smart meters exposed to outdoor thermal cycling. IC Role / Device Role / Timing Role: Secure, low-power identity and parameter storage; read/written infrequently during firmware updates or utility commands - optimized for battery backup operation. Use Value: 1.7V operation enables direct use with supercapacitor backup; EUI-64™ simplifies AMI network registration without centralized database mapping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM identity storage applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24AA02E64-E/SN | 8-byte EUI-64™ address, but 8-byte page write (not 16-byte); no A0/A1/A2 pins - fixed single-device address | Lacks cascading capability; simpler layout but no multi-device bus support | Select when only one identity EEPROM per system is needed and page write efficiency is secondary |
| AT24CM02-SSHM-T | 2 Kbit I²C EEPROM with EUI-64™, 16-byte page, but rated only for industrial temp (–40°C to +85°C); different pinout (SOIC-8 only) | Not qualified for automotive use; lacks SOT-23-6 option for space-constrained modules | Select for cost-sensitive industrial designs where extended temperature range is unnecessary |
Compared with 24AA02E64-E/SN, the 24AA025E64-E/SN adds cascading support and faster page writes; versus AT24CM02-SSHM-T, it provides full AEC-Q100 automotive qualification and dual-package flexibility - critical for safety-critical vehicle networks.
Availability
24AA025E64-E/SN is available at Aetrix Electronics and suitable for industrial IoT edge nodes, automotive telematics modules, medical diagnostic equipment, and smart energy meters requiring stable component supply across long production lifecycles.
Supply support for 24AA025E64-E/SN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology Inc. is a leading provider of microcontrollers, analog, FPGA, and memory solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software.
The 24AA025E64-E/SN belongs to Microchip's EUI-series serial EEPROM family, designed specifically to simplify hardware-based device identity management in standards-compliant networking and regulatory applications.
FAQ
What is the exact memory organization and address protection scheme of the 24AA025E64-E/SN?
The 24AA025E64-E/SN contains 2 Kbit (256 bytes) of EEPROM organized as two 128-word blocks. The upper half (addresses 0x80–0xFF) is permanently write-protected to preserve the factory-programmed EUI-64™ node address stored at 0xF8–0xFF. The lower half (0x00–0x7F) remains fully readable and writable for user data. This hardware-enforced partitioning ensures identity integrity without firmware intervention.
Does the 24AA025E64-E/SN support true pin-to-pin replacement with the 24AA02E64-E/SN?
No, the 24AA025E64-E/SN is not pin-to-pin compatible with the 24AA02E64-E/SN. While both share SOIC-8 and SOT-23 footprints, the 24AA025E64-E/SN includes functional A0, A1, and A2 pins for cascading (A2 is NC in SOT-23-6), whereas the 24AA02E64-E/SN has those pins marked "NC" and unused. PCB layout must accommodate the additional address inputs if migrating to 24AA025E64-E/SN.
How does the 24AA025E64-E/SN handle I²C bus contention during ACK polling?
During ACK polling, the 24AA025E64-E/SN withholds acknowledgment while an internal write cycle is active. The master sends repeated Start + control byte (R/W = 0) sequences; the 24AA025E64-E/SN only responds with ACK once the 3–5 ms self-timed write completes. This allows deterministic bus recovery without fixed delay loops - a key advantage for real-time systems integrating the 24AA025E64-E/SN.
Can the EUI-64™ address in the 24AA025E64-E/SN be reprogrammed or overwritten?
No, the EUI-64™ address in the 24AA025E64-E/SN is factory-programmed into the write-protected upper memory block (0xF8–0xFF) and cannot be altered in-system. Any write attempt to this region is ignored. Only the lower 128 bytes (0x00–0x7F) are user-writable. This immutability is hardware-enforced and critical for standards-compliant device identity assurance in the 24AA025E64-E/SN.
What package variants and marking codes identify the 24AA025E64-E/SN?
The 24AA025E64-E/SN is supplied in 8-lead SOIC (SN) and 6-lead SOT-23 packages. SOIC units are marked "4A25E64E" (E-temp); SOT-23 units use 2-line marking: top line "AAACY", bottom line "WWNNN" (e.g., "251L7") per Microchip Drawing C04-057-SN. The "/E" suffix confirms automotive temperature qualification; "/SN" specifies narrow SOIC body.
24AA025E64-E/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
24AA025E64-E/SN FAQ
1.How can I place an order for 24AA025E64-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24AA025E64-E/SN on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 24AA025E64-E/SN reliable?
The price and inventory of 24AA025E64-E/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24AA025E64-E/SN is usually 5 days.
3.What payment methods are accepted for 24AA025E64-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24AA025E64-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24AA025E64-E/SN?
24AA025E64-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24AA025E64-E/SN order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 24AA025E64-E/SN?
For technical support, including 24AA025E64-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24AA025E64-E/SN requirements.
6.How does Aetrix verify that 24AA025E64-E/SN is sourced from the original manufacturer or authorized distributors?
All 24AA025E64-E/SN products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 24AA025E64-E/SN meets industry standards.
7.What is the process for return or replacement of 24AA025E64-E/SN?
All 24AA025E64-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24AA025E64-E/SN, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 24AA025E64-E/SN part is unused and in its original packaging.
Return procedure for 24AA025E64-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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